Reinforced paper



P. T. JACKSON, JR.

REINFQRCED PAPER.

APPLICATION FILED SEPT. 9. 1918.

1,335,058. Patented Mar. 30,1920.

2 SHEETS-SHEET 1- In venz bz" P. T. JACKSON, In. REINFORCED PAPER.

1 APPLICATION FILED SEPT. 9. I918. 1,335,058. I. Patented MEL1.'30,1920.

2 SHEETS-SHEET 2.

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PATRICK TRACY JACKSON, J'B.', OF CAMBRIDGE, MASSACHUSETTS, ASS IGNOR 'I'O PAPER PRODUCTS MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF nessaonusnrrs.

To all whomit may concern.

Be it known that I, 'PATRICK TRACY J AOK- son, Jr, a citizen of the United States, residin at Cambridge, county of Middlesex, and gtate of Massachusetts, have invented an Improvement in Reinforced ,Iaper, of which the following description, in connec Specification of Letters Patent. Application'flled September 9, 1918. Serial No.

tion with the accompanying drawings, is aspeciiication, like characters on the drawings representing like parts. I

The invention to be hereinafter 4 described relates to reinforced paper fabrics adapted for use as a protecting cover or wrapper, or as an eflicient material for makbags or other containers.

The paper fabric may be reinforced by" filaments, in the present instance, in the form of unspun fibers in substantially their natural condition, and the preparation thereof may be carried into effect by the usual process of sc'utching, hackling, drawing or any or all employed in the preparation of'ramie, hemp, sisal, flax, and other forms of fiber wherein the staple or length of the fiber is greater than in some of the other natural fibers. It is preferable to employ fibers of long staple, but it is to be understood that any natural fiber unspun or untwisted may be employed.

In Letters Patent, No. 1,255,818, granted to P. T. Jackson, Jr., February 6, 1918, is shown, described and claimed a paper fabric reinforced by unspun fibers such as described above. The present application relates to a paper fabric differing in certain respects from that shown in said patent, and a methpd of making the fabric.

In carrying the invention into practical efiect the fibers which have been pre- ,yiously prepared and arranged in substanftially parallel relation in the usual fiber preparing machines, are fed longitudinally to a strip of paper or other suitable material, and preferably are adhesively secured thereto. The paper strip may be previously gummed and then moistened to secure the fibers thereto, or an adhesive coating may be applied to the paper strip {as it is fed through the machine. In some cases it may be desirable to superpose upon the paper to the strip 'or -in end to end relation,

strip may be reinforced by unspun fibers ex? anmron'osn PAPER.

Patented Mar. 30, 1920.

strip, referred to, a second strip of paper-of other suitable material, but this is not indis ensable.

fter the unspun fibers have been applied between the strips, the present invention contemplates that the sheet thusformed shall be severed at intervals to form sections. Then these sections are applied to another strip of paper or other suitable materiahwhich, in some instances, maybe reinforced by unspun fibers extendinglongitudinally thereof. .An important feature of theinvention consists inapplying the sections to the strip so that the unspun fibers of the sections extend transversely to the length of "the stri preferably secured to the strip by a watersaid sections being proof or other appropriate adhesive. The

sections may be superposed upon the strip so that in efiect the tending transversely thereof throughouttlie lefn h of the strip. p

y this method an efiicient paper fabric may be readily and rapidly manufactured, comprising a strip of paper having of transverse unspun fibers mounte on a backing, and so disposed with respect to the clips strip, as to supply eflieient transverse reinforcement thereto, .and where the uns'pun fibers are also applied to the strip longtytudinally thereof, an effective fabric is ro-' vided having reinforcing fibers exten g both" longitudinally and transversel of the strip. Also, the reinforcement had y'these fibers is desirably supplemented by the backing for the transverse fibers.

The character of the invention may be,

best understood by reference to the following description of a reinforced paper fabric which may be made by a method conveniently practised in an apparatus shown in the accompanying drawings, wherein Figure 1 is a vertical longitudinal section showing conventionally the elements of an apparatus for making the'sections or backings having the transverse unspun fibers ap plied thereto;

Fig. 2 is a vertical longitudinal section of the portion of an apparatus having elements fat ' sections or backings;

' Fig. 3 is a plan of a strip of paper having 5 the sections or backings applied thereto;

Fig. 4 is a'plan of areinforced paper fabric produced by the method;

Fig. 5 is a modified form of reinforced paper fabric which may be made by the method ;I and h Fig. 6 on a very large scale is a section taken on line 66 of Fig. 5.

The sections having the unspun fibers extending transversely thereof may be made by any suitable means. To accomplish this, in the present instance, an apparatus is shown in Fig. 1 of the drawing, comprising a pair of opposed calender rolls '1 and. 3 which may be provided with any suitable in. A strip 5 of paper or other suitable material may be led froma supply roll 7 past a guide roll 9 to and between said calender rolls. This strip of paper may have a waterproof or other suitable adhesive coating on one face thereof, which may be applied by passing the strip between a pair of upper and lower rolls 11', the lower rollbeing adapted to-conduct the adhesive to the strip from a trough 13'. h

The unspun fibers 14 may be delivered to the paper from a suitable station in general pa allel relation. To accomplish this, an endless belt 15 may be provided for feeding the fibers over a table 16 to and between the calender rolls, and in the course of their transit therebetween, they are pressed to the adhesively coated paper strip andsecured thereto.

In some instances it maybe desirable to superpose a strip of thin paper or other suitable material upon the fibers. To accomplish this a strip 17 of aper or other suitable material maybe led 30m a supply roll 19 tween calender rolls, which will press the superposed strip on the fibers and into adhesive engagement with the coating on' the lower strip. a The present invention contem lates tha the material thus reinforced sha I be cut at intervals into sections. .This may be accomplished by any suitable means,'which, in the present instance, may be in the 'form 'of a cutting. roll 23pi'ovidedwith a knife 25 cooperating with a hard surfaced roll 26 driven by any suitable dn'ving meansunnecessary to be illustrated herein. The material may be conducted over a'table 27 past transit, will be severed into sections 29.

These sections may be a pair of rolls driving means unnecessary to illustrate hereover a guide roll 21, and thence to and bethe cutter roll, and in the course of its sections may be stacked on a suitable support 33.

Any suitable means may be provided for preparing the strip of paper or other suitable material to receive the sections produced as described. To accomplish this, in the present instance, a pair of calender rolls .35 and 37 (Fig. 2) are provided driven by any suitable means. A strip of pa er 39 or other suitable material may be 1 from a supply roll 41 past a ide roll 48 to and between the calender ro ls. If unspun fibers 53 are to be applied to the paper strip 39, the may be conducted from a suitable station y ail endless belt 54 working over a table 55 to and between the calender rolls 35 and 37, which will serve to press the fibers to the adhesive coating" on said paper strip.

Suitable means may be provided for applying a waterproof or other appropriate adhesive coating to the paper strip 39. To

accomplish this, thelatter may be fed between a palr of upper'and lower rolls 57, the lower of which conducts the adhesive from a trough 59 to thelower face of the paper strip. The unspun fibers are pressed and secured by the calender rolls to the ad hesive coating on the strip.

Then the sections 29 may be transferred manually or by suitable mechanism from the stack support 33 to the paperstrip 39. The sections may be conveniently applied to the paper strip as it is fed between the calender rolls 35 and 37. For this purpose anendless belt 60 may be provided having a horizontal run 60 and an inclined run 60" above the belt 54 and leading to the bight between the calender rolls, the latter serving to pressrthe sections onto the adhesive coating on the paper strip.. The sections are placed on the strip progressively in end to end relation, and the ends of adjacent sections may meet or may have slight spaces .between them as desired.

It will be understood that the sections 'stri 39. If eac section comprises merely a bac ing with. fibers thereon, the section may be superposed on the strip, so that the fibers of the section will contact with the strip or with the longitudinal fibers thereon, so that the product will comprise outer aper layers 53 and 55 with longitudinal fibers 57 and transversefibers 59 between said layers and embedded in an adhesive layer 61, as will be noted in Fig. 4.

If,,however, each section has a covering strip 17 of paper or other suitable material, the product will comprise a paper layer'63, longitudinal fibers 65, and transverse fibers 67 between paper layer-s69 and 71, the fibers being embedded in an adhesive layer 78,

and'the fibers 67 being embedded in an adhesive layer 75, as will be noted in- Fig. 5. Since the covering strip is preferably a w thin tissue, it preferably will be interposed between the stronger outer paper layers 63 and 71. i Q

It will be understood that the invention is not limited to the specific articles and method described herein, but that various deviations may be made therefrom Without departin from the appende claims.

What is claimed is 1. As an article of manufacture, a reinforced fabric comprising a paper layer having strengthening unspun fibers secured thereto extending in general parallel relation longitudinally of the paper layer, and

paper sections. having strengthening unspun fibers secured thereto extending in general parallel relation transversely to the paper layer, ,said' paper sections and their fibersbeing each adhesively secured as a unit to said paper layer.

2. As an article of manufacture, a paper fabriccomprising in its construction a layer or strip of paper having reinforcing filaments secured thereto in general parallel relation longitudinally of the paper layer or strip, and paper sections having reinforcing filaments secured thereto and extending in general parallel relation, and an adhesive spirit and scope of the uniting the reinforced paper sections to the paper layer or strip with the reinforcing reinforcing filaments secured to said sections and extending transversely to the paper strip.

5. As an article of manufacture, a reinforced fabric comprising a paper layer having strengthening. filaments extendm'g longitudinally thereof, paper sections having strengthening filaments secured thereto, said paper sections being superposed on the paper layer With the strengthening fi1a-.

ments of said sections opposed to and extending transversely to the strengthening filaments of said paper-layer, and a waterproofadhesive for securing said fibers to said paper layer and sections.

In testimony whereof, I have signed my name to this specificatiom PATRICK TRACY JACKSON, .ni. 

